About the Coin Flip Simulator
A coin toss is the simplest way to settle a choice between two options. This simulator flips a fair coin when you press Generate, using your browser's secure random number generator, so heads and tails each have exactly a 50 percent chance. Flip it once for a quick decision, or many times to watch probability at work, with the counts, the percentages and the longest streak of the same side. Type how many flips you want and the coin flip appears at once, with a few related figures underneath, and you can copy the result with one tap. The sums run in your browser, so nothing you enter is uploaded.
Updated October 2026
How to use the Coin Flip Simulator
- 1Enter how many flips you want.
- 2Pick the units or options from the menus if the coin flip tool offers them.
- 3Read the coin flip in the large result box.
- 4Look at the extra rows for related figures.
- 5Press Copy result to keep the answer.
When you need the coin flip
Use it to decide who goes first, to pick between two restaurants or to teach probability. Teachers flip a thousand coins in a second to show the law of large numbers: the more flips, the closer the share of heads gets to one half.
Streaks are normal. People think that a fair sequence should alternate often, but a run of six or seven heads in a hundred flips is quite likely. A sequence of H and T for the first 200 flips is shown so you can see them.
How the coin flip is worked out
Each flip is independent with a probability of one half. The longest streak in n flips is typically about the base-2 logarithm of n. Flipping 100 times usually gives between 40 and 60 heads. In 1,000 flips the share of heads moves much closer to 50 percent, and the longest streak is often around 9 or 10 in a row.
Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.
- 1 to 100,000 flips
- Counts, percentages and streak
- Secure random numbers
Mistakes to avoid with coin flip
The coin has no memory, so a streak of heads does not make tails more likely next time. That mistake is called the gambler's fallacy. Also, pressing the button again does a new, independent set of flips.
On phone and computer
On a phone, type into the boxes one after another and read the coin flip underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the coin flip move. The coin flip simulator works the same on both. For other random choices, Dice Roller gives you a six-sided or custom die, Random Number Generator picks numbers in a range, Spin the Wheel is more playful, and Random Name Picker chooses a person fairly.
Features
- Streaks are normal
- No memory between flips
- A new press means new flips
- Clear messages when the coin flip inputs make no sense
- Copy the result with one tap
- Private: nothing is uploaded
Frequently asked questions
How do I calculate coin flip?
Each flip is independent with a probability of one half. The longest streak in n flips is typically about the base-2 logarithm of n. Flipping 100 times usually gives between 40 and 60 heads. In 1,000 flips the share of heads moves much closer to 50 percent, and the longest streak is often around 9 or 10 in a row.
What is the formula for coin flip?
Each flip is independent with a probability of one half. The longest streak in n flips is typically about the base-2 logarithm of n. The coin flip simulator applies it exactly and rounds only the displayed answer to six significant figures.
Is the coin really fair?
Yes. Each flip uses a secure random number, so heads and tails are equally likely.
Can I flip several coins?
Choose a number of flips. The tool shows how many were heads and how many tails.
What is the chance of 10 heads in a row?
One in 1,024, about 0.1 percent.
Is this coin flip simulator free and private?
Yes. It is free, needs no account and runs in your browser, so the numbers you type are not uploaded or stored.